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控件位移动画用NSLayoutConstraint来实现

 3 years ago
source link: http://quangelab.com/view-LayoutConstraint-animate/
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控件位移动画用NSLayoutConstraint来实现 – ruquan.z – github技术博客，成长在于积累。

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控件位移动画用NSLayoutConstraint来实现

现在很多项目都用autolayout布局了，如果实现一个空间从左到右的一个切入动画，可以通过设置位置NSLayoutConstraint.constant来实现，例如

[UIView animateWithDuration:0.5 animations:^{
            
            self.m_pEditLeft.constant = 0.0;
            [self.view layoutIfNeeded];
        } completion:^(BOOL finished) {
            
        }];

其中必须要调用layoutIfNeeded才可以，否则没有效果，在此做个笔记。

Written on February 8, 2015

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